I'm not positive, but home teams are supposed to wear a dark shade. Most teams recognize that certain schools traditionally wear white as home (LSU and Georgia Tech are the only two that come to mind) and they do conform to LSU's tradition. However, certain exceptions due come to mind (ex: Vanderbilt wearing white after the year we got Dinardo forcing us to wear a darker shade - we went with gold).

Now, excuse me for pointing out the obvious, but don't you think it would be somewhat difficult for the players to decipher between one team wearing a shade of grey with the other wearing white?